package com.supermap.tool;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.apache.log4j.Logger;


/**
* @ClassName: HttpRequest 
* @Description: 发送get post请求
* @author yuyao
* @date 2018年2月27日 下午4:38:32
 */
public class HttpRequest {
	
	//log4j2 日子管理
	protected static Logger LOG=Logger.getLogger(HttpRequest.class);

	/**
     * 向指定URL发送GET方法的请求
     * @param url 发送请求的URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            LOG.error("发送GET请求出现异常！", e);  
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }
    
    /** 
     * 向指定URL发送GET方法的请求 
     */  
    public static String get(String url) {  
        BufferedReader in = null;  
        try {  
            URL realUrl = new URL(url);  
            // 打开和URL之间的连接  
            URLConnection connection = realUrl.openConnection();  
            // 设置通用的请求属性  
//            connection.setRequestProperty("accept", "*/*");
//            connection.setRequestProperty("connection", "Keep-Alive");
//            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
//            connection.setConnectTimeout(5000);
//            connection.setReadTimeout(5000);
            // 建立实际的连接  
            connection.connect();  
            // 定义 BufferedReader输入流来读取URL的响应  
            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));  
            StringBuffer sb = new StringBuffer();  
            String line;  
            while ((line = in.readLine()) != null) {  
                sb.append(line);  
            }  
            return sb.toString();  
        } catch (Exception e) {  
        	LOG.error("发送GET请求出现异常！", e);  
        }  
        // 使用finally块来关闭输入流  
        finally {  
            try {  
                if (in != null) {  
                    in.close();  
                }  
            } catch (Exception e2) {  
                e2.printStackTrace();  
            }  
        }  
        return "error"; // 自定义错误信息  
    }  
    

    /**
     * 向指定 URL 发送POST方法的请求
     * @param url 发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.append(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
        	LOG.error("发送post请求出现异常！", e);  
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }    
    
    /** 
     * 发送HttpPost请求 
     * @param strURL 服务地址 
     * @param params 
     * @return 成功:返回json字符串<br/> 
     */  
    public static String jsonPost(String strURL, Map<String, String> params) {  
        try {  
            URL url = new URL(strURL);// 创建连接  
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();  
            connection.setDoOutput(true);  
            connection.setDoInput(true);  
            connection.setUseCaches(false);  
            connection.setInstanceFollowRedirects(true);  
            connection.setRequestMethod("POST"); // 设置请求方式  
            connection.setRequestProperty("Accept", "application/json"); // 设置接收数据的格式  
            connection.setRequestProperty("Content-Type", "application/json"); // 设置发送数据的格式  
            connection.connect();  
            OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream(), "UTF-8"); // utf-8编码  
            out.append(JSON.toJSONString(params));
            out.flush();  
            out.close();  
  
            int code = connection.getResponseCode();  
            InputStream is = null;  
            if (code == 200) {  
                is = connection.getInputStream();  
            } else {  
                is = connection.getErrorStream();  
            }  
            // 读取响应  
            int length = (int) connection.getContentLength();// 获取长度  
            if (length != -1) {  
                byte[] data = new byte[length];  
                byte[] temp = new byte[512];  
                int readLen = 0;  
                int destPos = 0;  
                while ((readLen = is.read(temp)) > 0) {  
                    System.arraycopy(temp, 0, data, destPos, readLen);  
                    destPos += readLen;  
                }  
                String result = new String(data, "UTF-8"); // utf-8编码  
                return result;  
            }  
  
        } catch (IOException e) {  
        	LOG.error("发送post请求出现异常！", e);  
        }  
        return "error"; // 自定义错误信息  
    }  
}
